Development of an electron beam irradiation design for use in the treatment of municipal biosolids and wastewater effluent

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Title: Development of an electron beam irradiation design for use in the treatment of municipal biosolids and wastewater effluent
Author: Lazarine, Alexis Dawn
Abstract: The need for pathogen -free water supplies has spurred investigations into the use of ionizing radiation for the treatment of wastewater effluent and municipal biosolids . The objective of this research was to develop an electron -beam irradiation scenario to effectively eliminate microbial pathogens from municipal biosolids and wastewater effluent . The Monte Carlo N -Particle (MCNP5 ) radiation transport code was used to simulate the irradiation scenario . Using MCNP5 , dual electron -beam sources were modeled as planar surface sources above and below a stainless steel delivery trough containing either effluent water or one of two biosolids material compositions . A dose deposition analysis was performed to assess both the planar dose distribution and 25 depth -dose curves . In addition , a density perturbation study was performed to assess the variance in the dose deposition for different mass solids concentrations . To validate the MCNP5 code for this type of application , a benchmark study was performed . Two municipal biosolids materials and water were irradiated in plastic bags on a conveyor belt using a 10 -MeV electron accelerator with the exit window below the material . The experimental configuration was modeled with the MCNP5 radiation transport code . Simplified and detailed models were created and analyzed . Lastly , an economic analysis was performed to assess whether this treatment method is a financially viable alternative to current wastewater treatment methods . Processing capacity was calculated for two accelerator specifications . These capacity rates in conjunction with the operating and capital costs per dry ton to irradiate the material were compared with existing data for electron beam processing of municipal biosolids . The cost breakdown was also compared with quoted costs for existing conventional methods . The models developed showed that the use of 10MeV electron -beam technology for the treatment of wastewater effluent and municipal biosolids is effective and economically feasible . The benchmarking study illustrated the accuracy of Monte Carlo simulation for this type of application . The method development process was shown to be adaptable for various material compositions and irradiation configurations .
URI: http : / /hdl .handle .net /1969 .1 /ETD -TAMU -2787
Date: 2009-05-15

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Development of an electron beam irradiation design for use in the treatment of municipal biosolids and wastewater effluent. Available electronically from http : / /hdl .handle .net /1969 .1 /ETD -TAMU -2787 .

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